package com.gulimall.cart.interceptor;

import com.common.constant.AuthServerConstant;
import com.common.constant.CartConstant;
import com.common.vo.MemberResponseVO;
import com.gulimall.cart.vo.UserInfoTo;
import org.apache.commons.lang.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * @author mayifan
 * @version 1.0
 * @date 2025-01-09 10:42
 */
public class CartInterceptor implements HandlerInterceptor {

    //使用ThreadLocal用一个线程来共享数据
    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession httpSession = request.getSession();
        MemberResponseVO memberResponseVO = (MemberResponseVO) httpSession.getAttribute(AuthServerConstant.LOGIN_USER);
        if(memberResponseVO!=null){
//            已登录
            userInfoTo.setUserId(memberResponseVO.getId());
        }
        Cookie[] cookies = request.getCookies();
        if(cookies!=null&&cookies.length>0){
            for (Cookie cookie : cookies) {
                String name = cookie.getName();
                if(name.equals(CartConstant.TEMP_USER_COOKIE_NAME)){
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);
                }
            }
        }
//        没有临时用户，创建一个临时用户
        if(StringUtils.isEmpty(userInfoTo.getUserKey())){
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }
//        目标方法执行前，将用户信息保存到ThreadLocal
        threadLocal.set(userInfoTo);

        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();
        if(!userInfoTo.isTempUser()){
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME,userInfoTo.getUserKey());
            cookie.setDomain("gulimall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }
    }
}
